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Abstract #1173

Towards Higher Spatial Resolution Echo-Planar-Imaging With A Compact Head 3T System

Ek T Tan1, Seung-Kyun Lee1, Paul Weavers2, Matthew Middione3, Matt A Bernstein2, John Huston2, and Thomas KF Foo1

1GE Global Research, Niskayuna, NY, United States, 2Mayo Clinic, Rochester, MN, United States, 3GE Healthcare, Menlo Park, CA, United States

It is challenging to increase spatial resolution (≤1.5 mm) in whole-brain, single-shot echo-planar-imaging (ss-EPI) on conventional whole-body systems due to EPI distortion and limited SNR. A compact head 3T system with an asymmetric head gradient coil capable of high gradient amplitude and 3.5 times the slew rate of whole-body systems can enable ss-EPI acquisition with high spatial resolution and reduced spatial distortion, simultaneously. This work compares spin-echo and gradient-recalled-echo ss-EPI between the compact and whole-body systems, showing substantially reduced distortion and signal dropout, and shorter echo-times. Results with the high performance gradient were also demonstrated in multi-band-accelerated, high b-value diffusion-imaging.

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